/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 */

#include <dputil.hxx>
#include <dpitemdata.hxx>
#include <dpnumgroupinfo.hxx>
#include <globstr.hrc>
#include <scresid.hxx>
#include <generalfunction.hxx>

#include <comphelper/string.hxx>
#include <unotools/localedatawrapper.hxx>
#include <unotools/calendarwrapper.hxx>
#include <svl/numformat.hxx>
#include <svl/zforlist.hxx>
#include <rtl/math.hxx>
#include <o3tl/string_view.hxx>
#include <osl/diagnose.h>

#include <com/sun/star/sheet/DataPilotFieldGroupBy.hpp>
#include <com/sun/star/i18n/CalendarDisplayIndex.hpp>

using namespace com::sun::star;

namespace {

const sal_uInt16 SC_DP_LEAPYEAR = 1648;     // arbitrary leap year for date calculations

OUString getTwoDigitString(sal_Int32 nValue)
{
    OUString aRet = OUString::number( nValue );
    if ( aRet.getLength() < 2 )
        aRet = "0" + aRet;
    return aRet;
}

void appendDateStr(OUStringBuffer& rBuffer, double fValue, SvNumberFormatter* pFormatter)
{
    sal_uInt32 nFormat = pFormatter->GetStandardFormat( SvNumFormatType::DATE, ScGlobal::eLnge );
    OUString aString;
    pFormatter->GetInputLineString(fValue, nFormat, aString);
    rBuffer.append(aString);
}

OUString getSpecialDateName(double fValue, bool bFirst, SvNumberFormatter* pFormatter)
{
    OUStringBuffer aBuffer;
    aBuffer.append( bFirst ? '<' : '>' );
    appendDateStr(aBuffer, fValue, pFormatter);
    return aBuffer.makeStringAndClear();
}

}

bool ScDPUtil::isDuplicateDimension(std::u16string_view rName)
{
    return o3tl::ends_with(rName, u"*");
}

OUString ScDPUtil::getSourceDimensionName(std::u16string_view rName)
{
    return OUString(comphelper::string::stripEnd(rName, '*'));
}

sal_uInt8 ScDPUtil::getDuplicateIndex(const OUString& rName)
{
    // Count all trailing '*'s.

    sal_Int32 n = rName.getLength();
    if (!n)
        return 0;

    sal_uInt8 nDupCount = 0;
    const sal_Unicode* p = rName.getStr();
    const sal_Unicode* pStart = p;
    p += n-1; // Set it to the last char.
    for (; p != pStart; --p, ++nDupCount)
    {
        if (*p != '*')
            break;
    }

    return nDupCount;
}

OUString ScDPUtil::createDuplicateDimensionName(const OUString& rOriginal, size_t nDupCount)
{
    if (!nDupCount)
        return rOriginal;

    OUStringBuffer aBuf(rOriginal);
    for (size_t i = 0; i < nDupCount; ++i)
        aBuf.append('*');

    return aBuf.makeStringAndClear();
}

OUString ScDPUtil::getDateGroupName(
        sal_Int32 nDatePart, sal_Int32 nValue, SvNumberFormatter* pFormatter,
        double fStart, double fEnd)
{
    if (nValue == ScDPItemData::DateFirst)
        return getSpecialDateName(fStart, true, pFormatter);
    if (nValue == ScDPItemData::DateLast)
        return getSpecialDateName(fEnd, false, pFormatter);

    switch ( nDatePart )
    {
        case sheet::DataPilotFieldGroupBy::YEARS:
            return OUString::number(nValue);
        case sheet::DataPilotFieldGroupBy::QUARTERS:
            return ScGlobal::getLocaleData().getQuarterAbbreviation(sal_Int16(nValue-1));    // nValue is 1-based
        case css::sheet::DataPilotFieldGroupBy::MONTHS:
            return ScGlobal::GetCalendar().getDisplayName(
                        i18n::CalendarDisplayIndex::MONTH, sal_Int16(nValue-1), 0);    // 0-based, get short name
        case sheet::DataPilotFieldGroupBy::DAYS:
        {
            Date aDate(1, 1, SC_DP_LEAPYEAR);
            aDate.AddDays(nValue - 1);            // nValue is 1-based
            tools::Long nDays = aDate - pFormatter->GetNullDate();

            const sal_uInt32 nFormat = pFormatter->GetFormatIndex(NF_DATE_SYS_DDMMM, ScGlobal::eLnge);
            const Color* pColor;
            OUString aStr;
            pFormatter->GetOutputString(nDays, nFormat, aStr, &pColor);
            return aStr;
        }
        case sheet::DataPilotFieldGroupBy::HOURS:
        {
            //TODO: allow am/pm format?
            return getTwoDigitString(nValue);
        }
        break;
        case sheet::DataPilotFieldGroupBy::MINUTES:
        case sheet::DataPilotFieldGroupBy::SECONDS:
        {
            return ScGlobal::getLocaleData().getTimeSep() + getTwoDigitString(nValue);
        }
        break;
        default:
            OSL_FAIL("invalid date part");
    }

    return "FIXME: unhandled value";
}

double ScDPUtil::getNumGroupStartValue(double fValue, const ScDPNumGroupInfo& rInfo)
{
    if (fValue < rInfo.mfStart && !rtl::math::approxEqual(fValue, rInfo.mfStart))
        return -std::numeric_limits<double>::infinity();

    if (fValue > rInfo.mfEnd && !rtl::math::approxEqual(fValue, rInfo.mfEnd))
        return std::numeric_limits<double>::infinity();

    double fDiff = fValue - rInfo.mfStart;
    double fDiv = rtl::math::approxFloor( fDiff / rInfo.mfStep );
    double fGroupStart = rInfo.mfStart + fDiv * rInfo.mfStep;

    if (rtl::math::approxEqual(fGroupStart, rInfo.mfEnd) &&
        !rtl::math::approxEqual(fGroupStart, rInfo.mfStart))
    {
        if (!rInfo.mbDateValues)
        {
            // A group that would consist only of the end value is not
            // created, instead the value is included in the last group
            // before. So the previous group is used if the calculated group
            // start value is the selected end value.

            fDiv -= 1.0;
            return rInfo.mfStart + fDiv * rInfo.mfStep;
        }

        // For date values, the end value is instead treated as above the
        // limit if it would be a group of its own.

        return rInfo.mfEnd + rInfo.mfStep;
    }

    return fGroupStart;
}

namespace {

void lcl_AppendDateStr( OUStringBuffer& rBuffer, double fValue, SvNumberFormatter* pFormatter )
{
    sal_uInt32 nFormat = pFormatter->GetStandardFormat( SvNumFormatType::DATE, ScGlobal::eLnge );
    OUString aString;
    pFormatter->GetInputLineString( fValue, nFormat, aString );
    rBuffer.append( aString );
}

OUString lcl_GetSpecialNumGroupName( double fValue, bool bFirst, sal_Unicode cDecSeparator,
    bool bDateValues, SvNumberFormatter* pFormatter )
{
    OSL_ENSURE( cDecSeparator != 0, "cDecSeparator not initialized" );

    OUStringBuffer aBuffer;
    aBuffer.append( bFirst ? '<' : '>' );
    if ( bDateValues )
        lcl_AppendDateStr( aBuffer, fValue, pFormatter );
    else
        rtl::math::doubleToUStringBuffer( aBuffer, fValue, rtl_math_StringFormat_Automatic,
        rtl_math_DecimalPlaces_Max, cDecSeparator, true );
    return aBuffer.makeStringAndClear();
}

OUString lcl_GetNumGroupName(
    double fStartValue, const ScDPNumGroupInfo& rInfo, sal_Unicode cDecSep,
    SvNumberFormatter* pFormatter)
{
    OSL_ENSURE( cDecSep != 0, "cDecSeparator not initialized" );

    double fStep = rInfo.mfStep;
    double fEndValue = fStartValue + fStep;
    if (rInfo.mbIntegerOnly && (rInfo.mbDateValues || !rtl::math::approxEqual(fEndValue, rInfo.mfEnd)))
    {
        //  The second number of the group label is
        //  (first number + size - 1) if there are only integer numbers,
        //  (first number + size) if any non-integer numbers are involved.
        //  Exception: The last group (containing the end value) is always
        //  shown as including the end value (but not for dates).

        fEndValue -= 1.0;
    }

    if ( fEndValue > rInfo.mfEnd && !rInfo.mbAutoEnd )
    {
        // limit the last group to the end value

        fEndValue = rInfo.mfEnd;
    }

    OUStringBuffer aBuffer;
    if ( rInfo.mbDateValues )
    {
        lcl_AppendDateStr( aBuffer, fStartValue, pFormatter );
        aBuffer.append( " - " );   // with spaces
        lcl_AppendDateStr( aBuffer, fEndValue, pFormatter );
    }
    else
    {
        rtl::math::doubleToUStringBuffer( aBuffer, fStartValue, rtl_math_StringFormat_Automatic,
            rtl_math_DecimalPlaces_Max, cDecSep, true );
        aBuffer.append( '-' );
        rtl::math::doubleToUStringBuffer( aBuffer, fEndValue, rtl_math_StringFormat_Automatic,
            rtl_math_DecimalPlaces_Max, cDecSep, true );
    }

    return aBuffer.makeStringAndClear();
}

}

OUString ScDPUtil::getNumGroupName(
    double fValue, const ScDPNumGroupInfo& rInfo, sal_Unicode cDecSep, SvNumberFormatter* pFormatter)
{
    if ( fValue < rInfo.mfStart && !rtl::math::approxEqual( fValue, rInfo.mfStart ) )
        return lcl_GetSpecialNumGroupName( rInfo.mfStart, true, cDecSep, rInfo.mbDateValues, pFormatter );

    if ( fValue > rInfo.mfEnd && !rtl::math::approxEqual( fValue, rInfo.mfEnd ) )
        return lcl_GetSpecialNumGroupName( rInfo.mfEnd, false, cDecSep, rInfo.mbDateValues, pFormatter );

    double fDiff = fValue - rInfo.mfStart;
    double fDiv = rtl::math::approxFloor( fDiff / rInfo.mfStep );
    double fGroupStart = rInfo.mfStart + fDiv * rInfo.mfStep;

    if ( rtl::math::approxEqual( fGroupStart, rInfo.mfEnd ) &&
        !rtl::math::approxEqual( fGroupStart, rInfo.mfStart ) )
    {
        if (rInfo.mbDateValues)
        {
            //  For date values, the end value is instead treated as above the limit
            //  if it would be a group of its own.
            return lcl_GetSpecialNumGroupName( rInfo.mfEnd, false, cDecSep, rInfo.mbDateValues, pFormatter );
        }
    }

    return lcl_GetNumGroupName(fGroupStart, rInfo, cDecSep, pFormatter);
}

sal_Int32 ScDPUtil::getDatePartValue(
    double fValue, const ScDPNumGroupInfo* pInfo, sal_Int32 nDatePart,
    const SvNumberFormatter* pFormatter)
{
    // Start and end are inclusive
    // (End date without a time value is included, with a time value it's not)

    if (pInfo)
    {
        if (fValue < pInfo->mfStart && !rtl::math::approxEqual(fValue, pInfo->mfStart))
            return ScDPItemData::DateFirst;
        if (fValue > pInfo->mfEnd && !rtl::math::approxEqual(fValue, pInfo->mfEnd))
            return ScDPItemData::DateLast;
    }

    sal_Int32 nResult = 0;

    if (nDatePart == sheet::DataPilotFieldGroupBy::HOURS ||
        nDatePart == sheet::DataPilotFieldGroupBy::MINUTES ||
        nDatePart == sheet::DataPilotFieldGroupBy::SECONDS)
    {
        // handle time
        // (do as in the cell functions, ScInterpreter::ScGetHour() etc.)

        sal_uInt16 nHour, nMinute, nSecond;
        double fFractionOfSecond;
        tools::Time::GetClock( fValue, nHour, nMinute, nSecond, fFractionOfSecond, 0);

        switch (nDatePart)
        {
            case sheet::DataPilotFieldGroupBy::HOURS:
                nResult = nHour;
                break;
            case sheet::DataPilotFieldGroupBy::MINUTES:
                nResult = nMinute;
                break;
            case sheet::DataPilotFieldGroupBy::SECONDS:
                nResult = nSecond;
                break;
        }
    }
    else
    {
        Date aDate = pFormatter->GetNullDate();
        aDate.AddDays(::rtl::math::approxFloor(fValue));

        switch ( nDatePart )
        {
            case css::sheet::DataPilotFieldGroupBy::YEARS:
                nResult = aDate.GetYear();
                break;
            case css::sheet::DataPilotFieldGroupBy::QUARTERS:
                nResult = 1 + (aDate.GetMonth() - 1) / 3;     // 1..4
                break;
            case css::sheet::DataPilotFieldGroupBy::MONTHS:
                nResult = aDate.GetMonth();     // 1..12
                break;
            case css::sheet::DataPilotFieldGroupBy::DAYS:
                {
                    Date aYearStart(1, 1, aDate.GetYear());
                    nResult = (aDate - aYearStart) + 1;       // Jan 01 has value 1
                    if (nResult >= 60 && !aDate.IsLeapYear())
                    {
                        // days are counted from 1 to 366 - if not from a leap year, adjust
                        ++nResult;
                    }
                }
                break;
            default:
                OSL_FAIL("invalid date part");
        }
    }

    return nResult;
}

namespace {

const TranslateId aFuncStrIds[] = {
    {},                             // SUBTOTAL_FUNC_NONE
    STR_FUN_TEXT_AVG,               // SUBTOTAL_FUNC_AVE
    STR_FUN_TEXT_COUNT,             // SUBTOTAL_FUNC_CNT
    STR_FUN_TEXT_COUNT,             // SUBTOTAL_FUNC_CNT2
    STR_FUN_TEXT_MAX,               // SUBTOTAL_FUNC_MAX
    STR_FUN_TEXT_MIN,               // SUBTOTAL_FUNC_MIN
    STR_FUN_TEXT_PRODUCT,           // SUBTOTAL_FUNC_PROD
    STR_FUN_TEXT_STDDEV,            // SUBTOTAL_FUNC_STD
    STR_FUN_TEXT_STDDEV,            // SUBTOTAL_FUNC_STDP
    STR_FUN_TEXT_SUM,               // SUBTOTAL_FUNC_SUM
    STR_FUN_TEXT_VAR,               // SUBTOTAL_FUNC_VAR
    STR_FUN_TEXT_VAR,               // SUBTOTAL_FUNC_VARP
    STR_FUN_TEXT_MEDIAN,            // SUBTOTAL_FUNC_MED
    {}                              // SUBTOTAL_FUNC_SELECTION_COUNT - not used for pivot table
};

}

OUString ScDPUtil::getDisplayedMeasureName(const OUString& rName, ScSubTotalFunc eFunc)
{
    assert(unsigned(eFunc) < SAL_N_ELEMENTS(aFuncStrIds));
    TranslateId pId = aFuncStrIds[eFunc];
    if (!pId)
        return rName;
    return ScResId(pId) +        // function name
            " - " +
            rName;                   // field name
}

ScSubTotalFunc ScDPUtil::toSubTotalFunc(ScGeneralFunction eGenFunc)
{
    ScSubTotalFunc eSubTotal = SUBTOTAL_FUNC_NONE;
    switch (eGenFunc)
    {
        case ScGeneralFunction::NONE:       eSubTotal = SUBTOTAL_FUNC_NONE; break;
        case ScGeneralFunction::SUM:        eSubTotal = SUBTOTAL_FUNC_SUM;  break;
        case ScGeneralFunction::COUNT:      eSubTotal = SUBTOTAL_FUNC_CNT2; break;
        case ScGeneralFunction::AVERAGE:    eSubTotal = SUBTOTAL_FUNC_AVE;  break;
        case ScGeneralFunction::MEDIAN:     eSubTotal = SUBTOTAL_FUNC_MED;  break;
        case ScGeneralFunction::MAX:        eSubTotal = SUBTOTAL_FUNC_MAX;  break;
        case ScGeneralFunction::MIN:        eSubTotal = SUBTOTAL_FUNC_MIN;  break;
        case ScGeneralFunction::PRODUCT:    eSubTotal = SUBTOTAL_FUNC_PROD; break;
        case ScGeneralFunction::COUNTNUMS:  eSubTotal = SUBTOTAL_FUNC_CNT;  break;
        case ScGeneralFunction::STDEV:      eSubTotal = SUBTOTAL_FUNC_STD;  break;
        case ScGeneralFunction::STDEVP:     eSubTotal = SUBTOTAL_FUNC_STDP; break;
        case ScGeneralFunction::VAR:        eSubTotal = SUBTOTAL_FUNC_VAR;  break;
        case ScGeneralFunction::VARP:       eSubTotal = SUBTOTAL_FUNC_VARP; break;
        case ScGeneralFunction::AUTO:       eSubTotal = SUBTOTAL_FUNC_NONE; break;
        default:
            assert(false);
    }
    return eSubTotal;
}

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